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Note 9 - Discontinued Operations - Discontinued Operations Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other assets |  | $ 85 | $ 34
Total current assets |  | 85 | 34
Property, plant and equipment, net | [1] | 81 | 531
Other assets |  | 268 |
Total long-term assets |  | 349 | 531
Total assets |  | 434 | 565
Accounts payable |  | 13 | 85
Accrued expenses and other liabilities |  | 268 | 437
Environmental liabilities |  | 677 | 9
Total current liabilities |  | 958 | 531
Closure liabilities |  | 113 | 173
Environmental liabilities |  | 248 | 891
Total long-term liabilities |  | 361 | 1,064
Total liabilities |  | $ 1,319 | $ 1,595
[1] | net of accumulated depreciation of $10,000 for each period presented.

X
- Definition Amount classified as current assets attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount classified as environmental liabilities attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount classified as accounts payable and accrued liabilities attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount classified as accounts payable attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount classified as current and noncurrent assets attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount classified as assets attributable to discontinued operations not held for sale, expected to be disposed of after one year or the normal operating cycle, if longer. + References No definition available. + Details
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X
- Definition Amount classified as other assets attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount classified as other assets attributable to discontinued operations not held for sale, expected to be disposed of after one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | pesi_DisposalGroupIncludingDiscontinuedOperationOtherAssetsNotHeldForSaleNoncurrent
Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount classified as property, plant and equipment attributable to discontinued operations not held for sale, expected to be disposed of after one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | pesi_
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Balance Type: | debit
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X
- Definition Amount classified as liabilities attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount classified as liabilities attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount classified as liabilities attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
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X
- Definition Represents closure liabilities of discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
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X
- Definition Amount classified as environmental liabilities attributable to discontinued operations not held for sale. + References No definition available. + Details
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Namespace Prefix: | pesi_
Data Type: | xbrli:monetaryItemType
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